怎么用ctypes定义这个结构体？

typedef struct OptionDef {

    const char *name;

    int flags;

#define HAS_ARG    0x0001

#define OPT_BOOL   0x0002

#define OPT_EXPERT 0x0004

#define OPT_STRING 0x0008

#define OPT_VIDEO  0x0010

#define OPT_AUDIO  0x0020

#define OPT_INT    0x0080

#define OPT_FLOAT  0x0100

#define OPT_SUBTITLE 0x0200

#define OPT_INT64  0x0400

#define OPT_EXIT   0x0800

#define OPT_DATA   0x1000

#define OPT_PERFILE  0x2000     

#define OPT_OFFSET 0x4000     

#define OPT_SPEC   0x8000       

#define OPT_TIME  0x10000

#define OPT_DOUBLE 0x20000

#define OPT_INPUT  0x40000

#define OPT_OUTPUT 0x80000

     union {

        void *dst_ptr;

        int (*func_arg)(void *, const char *, const char *);

        size_t off;

    } u;

    const char *help;

    const char *argname;

} OptionDef;